SYNTHESIS OF THE 4 POSSIBLE STEREOISOMERS OF 21-METHYL-8-PENTATRIACONTENE, THE FEMALE CONTACT SEX-PHEROMONE OF THE YELLOW-SPOTTED LONGICORNBEETLE, PSACOTHEA-HILARIS

The synthesis of the four possible stereoisomers of 21-methyl-8-pentat riacontene, the (R)- and (S)-enantiomers of both (Z)- and (E)-geometri cal isomers, was achieved by starting from the enantiomers of 3-hydrox y-2-methylpropionate, 1-nonyne and 1,10-decandiol to evaluate the resp onse of the male yellow-spotted longicorn beetle, Psacothea hilaris.